Answer:
there's Yousician which has a 4.5 rating and pretty good reviews
Here's a list of a few apps that help you make music:
BandLab - Music Making Studio ( 4.7 stars )
GarageBand ( 3.9 stars)
Music Maker JAM (4.6 stars)
Remixlive - Make Music & Beats (4.7 stars)
Groovepad - Music & Beat Maker (4.7 stars)
Figure - Make Music & Beats (4.2 stars)
Notation pad - Sheet Music Score (4.3 stars)
Beat Maker Go - Make Music (4.3 stars)
Medly (4.7 stars)
Also there are some Music/vocal recording apps such as Spire, Voloco, and Acapella from PicPlayPost.
There are also a few video maker or music video maker apps like Tempo, Score Creator, and Zoomerang. hope this helped